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ORAL Powerplant Propellers
Terms in this set (21)
What can be used to clean a wooden propeller?
Warm water and mild soap together with a brush or cloth.
What is the purpose of an oil accumulator connected to a propeller governor?
To provide un-feathering oil pressure.
What is the alpha range of a turboprop?
The alpha range is operation in the constant speed mode (usually in flight).
To what do the terms "alpha range" and "beta range" pertain?
Both terms pertain to operating modes of turboprop reversible-pitch propellers.
What is the beta range of a turboprop?
The beta range is operation in the minimum or zero thrust, and negative (reverse) thrust modes (usually for ground handling and taxiing).
How is feathering accomplished on a constant speed propeller?
Releasing the governor oil pressure allows the counterweights and feathering spring to feather the propeller.
What may be used to remove repair file marks from aluminum propellers?
Very fine sandpaper.
What type of nondestructive testing should be accomplished to a propeller after blending?
The procedures recommended by the manufacturer.
On light aircraft propellers, what is the effect of centrifugal force acting on a propeller blade counterweights?
Centrifugal force acting on the counterweights serve to increase propeller blade pitch.
What positions of a two bladed propeller are used during a static balance test?
Vertical and horizontal.
What may be used to determine propeller blade angle?
A propeller protractor.
What two forces are balanced in a propeller governor in an on-speed condition?
Speeder spring and flyweight.
What happens to a constant speed feathering propeller when the propeller governor oil pressure drops to zero?
The propeller will feather.
What types of systems are used for propeller ice control?
Fluid (alcohol) and electrical.
What is blade tracking?
Blade tracking is determining the positions of the propeller blade tips in relation to each other.
What is the purpose of metal tipping fastened to a wooden propeller leading edge and tip?
To protect the propeller from damage.
What is the purpose of propellers?
The blade produces forces that create thrust to pull or push the airplane through the air.
How do you determine the repairability of a damaged propeller blade?
By reference to the manufacturer's manual.
What is a fixed pitch propeller?
A fixed pitch propeller is one that has a built-in blade angle that cannot be changed.
Other than maintaining constant speed, what are two actions of some controllable propellers?
Reverse pitch and feathering.
When engine vibration is reported, what should be checked to determine if it is caused by the engine or propeller?
Blade tracking and blade angle setting.
Recommended textbook explanations
Fundamentals of Electric Circuits
Charles Alexander, Matthew Sadiku
Signals and Systems
Alan S. Willsky, Alan V. Oppenheim, S. Hamid
Numerical Methods for Engineers
Raymond P Canale, Steven C Chapra
Fox and McDonald's Introduction to Fluid Mechanics
John C Leylegian, John W Mitchell, Philip J. Pritchard, Rajesh Bhaskaran, Robert W Fox
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